1231221442 has 8 divisors (see below), whose sum is σ = 2014726032. Its totient is φ = 559646100.

The previous prime is 1231221427. The next prime is 1231221443. The reversal of 1231221442 is 2441221321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 55964611 = 1231221442 / (1 + 2 + 3 + 1 + 2 + 2 + 1 + 4 + 4 + 2).

It is not an unprimeable number, because it can be changed into a prime (1231221443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27982284 + ... + 27982327.

It is an arithmetic number, because the mean of its divisors is an integer number (251840754).

Almost surely, 2^1231221442 is an apocalyptic number.

1231221442 is a deficient number, since it is larger than the sum of its proper divisors (783504590).

1231221442 is a wasteful number, since it uses less digits than its factorization.

1231221442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55964624.

The product of its digits is 768, while the sum is 22.

The square root of 1231221442 is about 35088.7651820351. The cubic root of 1231221442 is about 1071.7958145165.

Adding to 1231221442 its reverse (2441221321), we get a palindrome (3672442763).

The spelling of 1231221442 in words is "one billion, two hundred thirty-one million, two hundred twenty-one thousand, four hundred forty-two".